It looks like the flip flops are getting ready to go again. They learned a good packing tip from a flight attendant. To limit wrinkles lay multiple shirts or skirts or pants on top of each other. Then roll them all up together.
Flying long distances? Pack a pair of ballet type slippers in your carry on. They take up very little room. Once on the plane replace your shoes with the slippers. Your feet stay warm and comfortable without having bare feet.